Test stand for CO 2 accumulator electric heaters Maciej Ostręga, Piotr Dziurdzia

Test stand is working since 15 of March … Watlow and DIMECA Heaters still alive  On has been make swagelok connection on the Watlow heater to create the same conditions like in CO2 accumulator. The result should be soon. Status 2

Tested heaters ManufactorManufactor noDetails Nominal voltage [V] Nominal power [W] WATLOWFIREROD 1348K Standard epoxy insulation. Silicon wires DIMECA14/ ° bent, 55 mm metal tube insulation and 1100 mm flex hose additional insulation for silicon wires

WATLOW

DIMECA

Tested heaters Heater name Manufactor Calculated power at 230V Insulation resistance L-PE at 1051V Insulation resistance N-PE at 1051V IBL_004DIMECA GΩ IBL_009DIMECA GΩ CMS_010WATLOW MΩ Measurements before the test

Test cycle 1.Heating ON with high temp. setpoint 15 °C 2.Heating ON with low temp. setpoint -40 °C 3.Heating OFF with low temp. setpoint -40 °C [-55 °C]

Results and conclusion 1.All heaters are working fine 2.No epoxy damage observed after several heating-cooling cycles 3.Epoxy cracking can be caused by the swagelok fittings – under the test 4.DIMECA heaters has a big (huge) time delay with the response on power – interlocked heater at 120 ° C reached almost 300 ° C – no possibility to use it as an accumulator heaters!

Results and conclusion Heater name Manufactor Calculated power at 230V Insulation resistance L-PE at 1051V Insulation resistance N-PE at 1051V IBL_004DIMECA GΩ IBL_009DIMECA GΩ CMS_010WATLOW GΩ (cold) ~200 MΩ (warm) 2.8 GΩ (cold) ~200 MΩ (warm) Measurements after the test Heater name Manufactor Calculated power at 230V Insulation resistance L-PE at 1051V Insulation resistance N-PE at 1051V IBL_004DIMECA GΩ IBL_009DIMECA GΩ CMS_010WATLOW MΩ Measurements before the test

Other solutions Standard WATLOW heater with additional silicone insulation

Other solutions VULCANIC heaters

TODO 1.Continue the test of the heater with Swagelok connection 2.Additional studies for the floating insulation resistance problem 3.New tests with the new heaters - WATLOW with additional insulation + Vulcanic (?)

Backup slides

Test stand

Designed by Tomasz Kucharski

Test procedure electrical measurements heating with cooling (setpoint high) no heating with cooling (setpoint -40 °C) more details: (DFS) …/PROJECTS/ Accumulator_Heaters_Teststand/DOCUMENTS/ Test stand for CO2 accumulator electric heater.docx Accumulator electric heater - DATA.xlsx

Electrical measurements resistance of the heater insulation resistance earth leakage current more details: (DFS) …/PROJECTS/ Accumulator_Heaters_Teststand/DOCUMENTS/ Test stand for CO2 accumulator electric heater.docx Accumulator electric heater - DATA.xlsx Calculated EH resistance [Ω] Measured EH resistance [Ω] Insulation resistance [MΩ] Comments Calculated earth leakage current at 230VMeasured earth leakage current Voltage during the measurements [V] Calculated insulation resistance [MΩ] Test voltage >>50V100V250V500V1000V[mA][uA][mA][uA] L/PE over the measurement range ( >11 GΩ) E N/PE over the measurement range ( >11 GΩ) E